Ophthalmic Lenses with Variable Optical Absorption Spectra Suitable for Converting the Optical Absorption Spectra of Prescription Lenses to One with an Exponential Dependence on the Wavelength over the Visible Spectrum

US20180284486A1Inactive Publication Date: 2018-10-04GALLAS JAMES M +1

6 Cites 1 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.

Viewing Examples

Smart Image

Examples

Experimental program

Comparison scheme

Effect test

embodiment

Preferred Embodiment

[0028]A preferred embodiment of this invention comprises a Base Pair of prescription lenses with a first and fixed optical absorption spectrum over the UV, visible and near infrared spectrum of wavelengths; and a clip-on frame with a Complimenting lens with a second absorption spectrum and where the second absorption spectrum is adjusted so that the sum of the two spectra—added wavelength by wavelength—is an exponential function. This resulting spectrum is called the Combination Spectrum. Alternatively, the two preceding lenses can be described by their respective transmission spectra which, when multiplied together, yields a spectrum that represents the transmission spectrum of the composite. One can then obtain the optical absorption spectrum of the composite by the familiar algorithm, OD=−logT, which again should be an exponential function because of the specific selection of the transmission spectrum of the lens of the clip-on.

[0029]While the preferred embodi...

example 1

Determination of the Complimentary Spectrum From a Given Base Spectrum and for a Specific Combination Spectrum

[0036]In this example, an ophthalmic prescription lens of commercial prominence is currently promoted as a lens that significantly reduces blue light and thereby reduces glare and photo-stress (need to be aggressive but careful here). The transmission spectrum (Base Transmission) of this lens is shown in FIG. 2 and at any wavelength the transmission is defined as Tbaseλ.

[0037]In this example, the transmission spectrum of a melanin lens (the Combination Spectrum in this particular case) with a luminous transmission of 70% and suitable for indoor use is shown in FIG. 3 and at any wavelength has a transmission Tcombλ. An essential feature of this invention is that the transmission spectrum of the clip-on lens (the Complimentary Spectrum)—with the transmission at any wavelength is given by Tcomplλ as follows:

Tcomplλ=Tcombλ / Tbaseλ.

[0038]And the Complimentary Spectrum is shown in ...

second preferred embodiment

[0039]A method for defining the transmission or optical absorption spectrum for a variety of melanin-like spectra that correspond to different luminous transmissions for the Combination Spectrum.

[0040]A second preferred embodiment of this invention comprises a method for defining the transmission or optical absorption spectrum for a variety of melanin-like spectra that correspond to different luminous transmissions for the Combination Spectrum. This is important in order to meet specific requirements for determining, in advance: an average transmission of glare-causing blue light; an average transmission of melatonin suppressing blue light; or an average transmission of retina and macula-damaging blue light for the Combination spectrum.

[0041]As described in U.S. patent application Ser. No. 13 / 999,867, the preservation of color perception is assured by selecting the transmission spectrum of a specific lens so that its optical density is an exponential function of the wavelength over ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More

PUM

Login to View More

Abstract

An ophthalmic lens for clip-on frames is described that is tinted with a particular absorption spectrum such that when used over a tinted prescription lens, also having a specific absorption spectrum, will result in a final absorption spectrum that has an exponential dependence upon wavelength over the visible spectrum, thereby achieving the best possible preservation of color perception for the user.

Description

RELATED PRIORITY DATE APPLICATION[0001]This application claims the benefit under 35 U.S.C. 119(e) of the U.S. provisional application No. 62 / 478,029 filed on Mar. 28, 2017.TECHNICAL FIELD OF THE INVENTION[0002]The present invention relates to the field of eye ware and, more particularly to the field of eye ware products containing lenses. Still more particularly, the present invention discloses a combination of lenses, one in an eye ware frame and the other on a clip on the eye ware frame to form a desired absorption spectrum.BACKGROUND OF THE INVENTION[0003]An effective way to reduce the threat from the exposure of the eye to blue light is an ophthalmic lens that filters all or a part of the HEV light. However, such a lens will appear amber or yellow in color and will therefore face widespread commercial rejection because of cosmetic disapproval, At this point in time, the optical industry is addressing the threat of blue light exposure by filtering only part of the violet light—an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More

Application Information

Patent Timeline

04 Oct 2018

Publication

US20180284486A1

IPC: G02C9/04; G02C7/10

CPC: G02C9/04; G02C7/10; G02C7/086; G02C7/104

Inventors: GALLAS, JAMES M.; SALK, DAVID